tests: increase (compile) timeout multiplier for T13701 and MultiLayerModules
Those tests are currently making our i386 validation fail on CircleCI:
Test Plan: Using my Phab<->CircleCI bridge to run i386 validation for this diff.
Reviewers: bgamari, monoidal
Reviewed By: monoidal
Subscribers: rwbarton, carter
Differential Revision: https://phabricator.haskell.org/D5103